Cita APA (7a ed.)

Zim, H. S. (1961). Rocks and how they were formed. Golden Press.

Cita Chicago Style (17a ed.)

Zim, Herbert Spenser. Rocks and How They Were Formed. New York: Golden Press, 1961.

Cita MLA (9a ed.)

Zim, Herbert Spenser. Rocks and How They Were Formed. Golden Press, 1961.